I have a question about familiar magic resistance rules.
It's said, p105 that familiar uses the better of their magic resistance or the magus' forms resistance (but without parma ability x5) and that the magus use the better of their parma (+ form bonus) or their familiar magic resistance.
Okay.
Now, imagine we have a magus which has gone on an immortal path and has an effective score of magic might, higher than his familiar's.
Can the familiar use the better of (his magic resistance, the magus' magic resistance or the magus' forms resistance) ? or nothing change?
EG: against a CrIg spell of pillum of fire:
familiar's magic might 53
magus magic might 95
magus ignem form: 12
Does the familiar have a magic resistance of 53 (normal rule: 53 is the best of 53 and 12) or 95 (best of 53, 95 and 12) ?
Subquestion: what if the magus has a pillum of fire spell with magic resistance mastery.
Magic resistance of the familiar: 53 or 106, or if you answered 95 previously 95 or 190?
Tmk (see TMRE p.134 box, TMRE p.73) it requires extra effort and vis to bring a familiar to the same state of immortality as her magus - unless she was a Spirit Familiar (TMRE p. 66ff, 81f) before. While doing so, the nature of the familiar bond does not change. And by that nature the familiar inherits the Form resistance of her magus, not any Might resistance (ArM5 p.105, TMRE p.68).
The magus might attempt to extend TMRE p.134 box, to expand the familiar bond and have her inherit also his Might resistance, though. Whether that requires a - minor - breakthrough or just a slight complication of the means of the magus' immortality is a troupe decision: after all, a brother of the same Mystery Cult might have made that breakthrough before.
Ok so your solution is a breakthrough. I like it, because the magus is an archmagus NPC, with more than 20 years to play, and labtotals so high that it unravel the magic theory with speed; and he has luck virtue, which was the start of his success. I could go that way but I felt it would be something the bond should be already giving since the bond can use "form resistance" from the magus and "magic resistance" from the familiar to affect the other, I thought the only reason the core didn't mention what I exposed in my first post was that at first, in the 5th edition, magi were never to have magic resistance as in "might - magic resistance".
Have other people other opinions about this matter?
I also thought to use the vis he can extract to boost his familiar might via visfeeding table in the RoPM book, and thus, his own by the Bond, but well, that's an idea I keep in my bag of ideas for emergency times, and our saga is going to have some of those.
About the spirit familiar thing: Yeah, I thought that when planning the NPC but I can't see a magical being of such power being something non immortal. There are spirits and then, there are dragons which for some reason can only die in one way (death prophecy) and are regenerating each damage done to them each round (ritual power, constant effect). Being a magical being, it doesn't age, it doesn't need to eat, and it's power and virtue make it indestructible unless, basically, disintegrated in one round, so I decided it's immortal. I could rewrite the dragon to be a spirit dragon (since its might is already mentem oriented) stealing other dragons corpses to affect material world, but it would be a lot more powerful than I wanted it to be when I designed it.
That said, I think he has the virtue in his list (multiple initiations + a lot of twilight + way of the twilight + all the magical qualities virtues = a long... long list of virtue); in fact I think I made it the first pace on the mystery he was inventing.